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The piezoelectric properties of quartz and tourmaline have been investigated through a study of the converse piezoelectric effect. In the case of quartz, the piezoelectric constant has been measured from point to point across the specimen. Considerable variation in the ``constant'' has been...
Travel‐time curves are given for elastic waves through the earth in a region in which the velocity increases continuously with depth. These time‐distance curves have been approximated by an equation of the form X=aT 2 + bT from which the velocity depth relation has been deduced. A new method...
The limited range of previous measurements of thermal agitation voltage is pointed out and data are given which extend the range of resistances and frequencies considerably. The results substantiate Nyquist's theory for resistances up to 1.7×10 9 ohms and for frequencies between 1 and 10,000...
Hydrogen was electrolyzed into flat ring cathodes of magnetically soft iron in 0.5 N solutions of H 2 SO 4 or of KOH. The design of the electrolytic cell permitted magnetic testing at intervals. Magnetic hardening began after many hours provided the electrolytic current density was kept above a...
It is shown that the variation with depth of the density and elastic constants of a half‐space can be determined from the observed motion of the surface caused by a given distribution of stresses on the surface.
This paper presents some new methods of computing the sedimentation radius. The methods are founded on a curve for spheres, experimentally determined and constructed on the basis of the coefficient of resistance as a function of Reynolds number. When the validity of Stokes' law ceases, the...
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